It's episode 4 of this old novel by myself, Daniel's Nemesis, called XBook.

It's an alien invasion in 1918, just after the Great War has finished and we follow both sides of the action, from the human perspective as well as the alien perspective. Unfortunately, both perspectives are a bit skewed. Think Independence Day meets Blackadder Goes Forth with a touch of Salvador Dali mixed in. I did, and I wrote about it. 

Each week I read out a chapter and this time, Ginger is going on holiday with his girlfriend, unchaperoned. 

After I read the chapter, I shall then dissect it and start to bring out some psychobabble as well.